362 GASTEROPODA OF THE INFERIOR OOLITE. 



Delphinula funiculata, Phil., which I hold to be very much the same as D. funata, 

 Goldf . In the looseness of the whorls it also serves to remind us of T. segregatus. 

 Occurs rather abundantly in the " Base-bed " at Lincoln. Inferior specimens 

 in the Oolite-Marl of the Cotteswolds, rare. 



Group related to Delphinula alta, Morris and Lycett (Great Ool. Moll., pt. 1, 



p. 71, pi. ix, fig. 31). 



From a purely biological point of view it is probable that the " species " hereunder 

 described are all localised varieties of a generalised form, which might be focussed 

 under the general term Delphinula alta — the more so since these variations occur 

 on one horizon, and consequently do not in any way mark time. Delphinula alta 

 has been quoted as a fossil of the Lincolnshire Limestone by Mr. Etheridge ( Judd, 

 ' Geology of Rutland/ p. 282) ; but whether or not in reference to the strongly 

 marked fossils from the base of that formation at Lincoln, figured in pi. xxx, I 

 cannot ascertain. 



For this group generally cf. — 



Delphinula serrata, Buvig., ' Geol. Meuse,' pi. xxiv, figs. 26 — 29. 



— stellata, Buvig., op. cit., pi. xxiv, figs. 37 — 39. 



— hirsuta, Bug. Desl., MS., Cossmann, ' Etage Bath.,' p. 270, pi. x, 



figs. 42, 43. 



297. Delphinqla alta-bicaeinata, sp. nov. Plate XXX, fig. 8. 



Description : 



Height . . . . .10 mm. 



Width . . . . .12 mm. 



Shell irregularly turbinate, umbilicate ; apex obtuse, the apical whorls being 

 smooth ; number of whorls four ; sutural space very wide, almost gaping. The 

 penultimate is angular and bicarinate, each angle being marked by a studded belt 

 of tuberculations, those in the upper belt are the strongest. 



The body-whorl is large, extremely angular and bicarinate, the carinas being fur- 

 nished with large squamous tuberculations, strongest in the upper row, the tubercles 

 being very hollow. Fine and sinuous radial ornamentation pervades the sides, 

 especially.on the posterior area, where it is sometimes wrinkled up into a subsidiary 

 carina. The base is much produced, and has three raised spirals, the anterior one 



